Abstract
Defense priming describes the enhanced potency of cells to activate defense responses. Priming accompanies local and systemic immune responses and can be triggered by microbial infection or upon treatment with certain chemicals. Thus, chemically activating defense priming is promising for biomedicine and agriculture. However, test systems for spotting priming-inducing chemicals are rare. Here, we describe a high-throughput screen for compounds that prime microbial pattern-spurred secretion of antimicrobial furanocoumarins in parsley culture cells. For the best possible throughput, we perform the assay with 1-ml aliquots of cell culture in 24-well microtiter plates. The advantages of the non-invasive test over competitive assays are its simplicity, remarkable reliability, and high sensitivity, which is based on furanocoumarin fluorescence in UV light.
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